Generating the code skeleton for a big project

We are a small group of software engineers who have successfully completed a number of small projects. This time we are working on a large scale application (ASP.NET, C#, SQL Server) and it seems that our development process got out of control. The database design changes so often due to various inputs/requests for our client so we simply cannot catch up. We have tried using a few code generators but none of them gave us the productivity boost that we are hoping for. Does someone know of a ready to use code generator which could create SQL stored procedures, the data access layer and a skeleton for the business layer. Any suggestions are welcomed!